diff options
| author | Qii Wang <qii.wang@mediatek.com> | 2021-04-17 09:46:52 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2021-04-17 23:07:25 +0300 |
| commit | a80f24945fcfdff31bdf04837145e56570741a67 (patch) | |
| tree | fde7672ae8da9ba123a8023618d89c7b7614798b /drivers/i2c | |
| parent | 3186b880447ad3cc9b6487fa626a71d64b831524 (diff) | |
| download | linux-a80f24945fcfdff31bdf04837145e56570741a67.tar.xz | |
i2c: mediatek: Use scl_int_delay_ns to compensate clock-stretching
The parameters of tSU,STA/tHD,STA/tSU,STOP maybe out of spec due
to device clock-stretch or circuit loss, we could get a suitable
scl_int_delay_ns from i2c_timings to compensate these parameters
to meet the spec via EXT_CONF register.
Signed-off-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mt65xx.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index bf25acba2ed5..5ddfa4e56ee2 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -231,6 +231,7 @@ struct mtk_i2c { struct i2c_adapter adap; /* i2c host adapter */ struct device *dev; struct completion msg_complete; + struct i2c_timings timing_info; /* set in i2c probe */ void __iomem *base; /* i2c base addr */ @@ -607,7 +608,8 @@ static int mtk_i2c_check_ac_timing(struct mtk_i2c *i2c, else clk_ns = sample_ns / 2; - su_sta_cnt = DIV_ROUND_UP(spec->min_su_sta_ns, clk_ns); + su_sta_cnt = DIV_ROUND_UP(spec->min_su_sta_ns + + i2c->timing_info.scl_int_delay_ns, clk_ns); if (su_sta_cnt > max_sta_cnt) return -1; @@ -1176,6 +1178,8 @@ static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c) i2c->use_push_pull = of_property_read_bool(np, "mediatek,use-push-pull"); + i2c_parse_fw_timings(i2c->dev, &i2c->timing_info, true); + return 0; } |